'Kundt's rules' can also refer to...

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The propositions that (a) a distance or space divided into parts looks greater than the same distance or space undivided; and (b) an attempt to bisect a line with one eye closed usually results in a division too close to the nasal side of the open eye. See also filled-space illusion. [Named after the German physicist August Adolph Eduard Eberhardt Kundt (1838–94) who formulated them in the early 1860s]